The ornamental design for a tread of a tire, as shown and described.
FIG. 1 is a perspective view of a tread of a tire, it being understood that
the pattern is repeated uniformly throughout the circumference of the
tread and that the opposite side perspective view is a mirror image of
that shown; and,
FIG. 2 is an elevational view of the tire tread design shown in FIG. 1.
In the drawings, the broken lines defining the tire inner bead are for
illustrative purposes only and form no part of the claimed design.